share: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

termcap: add an entry for the foot terminal

MFC after: 3 days

Update the screen termcap entries

Those updates have been obtained form converting the terminfo information
provided by the screen sources to termcap.

MFC after: 3 days

Fix indentation of the Kitty entry

MFC after: 2 days

termcap: Add an entry for kitty

The project is here:
https://github.com/kovidgoyal/kitty/

I created a port (which now needs updating):
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233010

If only we could use terminfo :(

MFC after: 5 days
Approved by: bapt
Differential Revision: https://reviews.freebsd.org/D19060

Add termcap entries for TI Silent 703/707 terminals.

PR: 234716
Submitted by: Robert Clausecker <fuz@fuz.su>
MFC after: 1 week

termcap: add italics and tmux entries

- add "ecma+italics" cap
- use it in "xterm-basic"
- add "tmux"/"tmux-256color" caps, fixing "so" and "se" caps,
and sourcing "ecma+italics" and "screen"/"screen-256color"

Reviewed by: bapt
Differential revision: https://reviews.freebsd.org/D18363

Add termcap entries for the st terminal (https://st.sucksless.org)

MFC after: 3 days

Fix tab vs space indentation

MFC after: 3 days

termcap: add xterm-termite

Obtained from: DragonFly
MFC After: 1 week

Remove termcap entry reordering; install the file verbatim instead

termcap entry reordering requires ex (which is available via usr.bin/vi), which
breaks on build hosts where installworld is run with MK_VI == no (or when
make delete-old is run on ^/projects/building-blocks as vi, et al, are
removed on the branch when the knob is tweaked to => "no")

Reordering termcap was believed to improve performance, but the file is now
accessed via /etc/termcap.db, so /etc/termcap (and /usr/share/misc/termcap by
proxy) access is less preferred.

Reordering the file broke the historical comment <-> entry mapping as well,
which could muddle the purpose of entries in the file, so it could be
potentially harmful to readers in its reordered state.

Discussion took place on hackers@ here:
https://lists.freebsd.org/pipermail/freebsd-hackers/2014-December/046657.html

Discussed with: -hackers, mp
MFC after: 1 month
Sponsored by: EMC / Isilon Storage Division